When you lift a book from the ground to your desk, what kind of work do you do, negative or positive? by lifting the book, what do you change? does the book gain or lose energy? what kind of energy?

Consider the following position function. find (a) the velocity and the speed of the object and (b) the acceleration of the object. bold r left parenthesis t right parenthesisr(t)equals=left angle 6 t superscript 4 baseline comma 2 t cubed right angle6t4,2t3 for tgreater than or equals≥0

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig

Select the correct answer. what does the process of natural selection involve?